Abstract The growing demand of industries has led to environmental degradation due to excessive release of toxic chemicals. Nanotechnology has developed to combat the impacts integrated with industrial revolution. The present investigation proposes a remediation model for toxic dyes and poly aromatic hydrocarbons by effective use of nanotechnology. For this purpose, zinc sulphide (ZnS), silver sulfide (Ag2S) and bimetallic ZnS-Ag2S are synthesized from a single source precursor and evaluated as potential photocatalytic agents. The synthesized nanoparticles were characterized by a range of techniques like UV–visible, PL, XRD, EDX, TEM and TGA. The results indicated that prepared nanoparticles were crystalline, spherical in shape, possess obvious atomic planes with a size in the range of 6–12 nm. Each of the synthesized material was tested as potential photocatalyst candidate for the degradation of representative azo-dyes (Crystal Violet, Congo Red) and polyaromatic hydrocarbons (Naphthalene, Phenanthrene and Pyrene) under visible light irradiation source. The degradation efficiency of the synthesized nanoparticles was calculated to be more than 70% for Crystal Violet and 80%for Congo Red upon contact with the dye solutions for 50 min and pseudo second order kinetic model was found to be the best fit. The synthesized nanoparticles were also effective in its own significance for the degradation of polyaromatic hydrocarbons. The fragmentation study of polyaromatic hydrocarbons using nanoparticles postulates that phthalic acid pathway is the predominant mechanism for PAHs. It is recommended that environmental compartment with mix pollutants can conveniently be treated with a single material to an appreciable extent. The study offers economical and environment friendly remediation model.

中文翻译：

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ZnS偶联Ag 2 S纳米粒子的合成、表征和光催化性能：环境污染物的修复模型

摘要 工业不断增长的需求导致有毒化学品的过量释放导致环境恶化。纳米技术的发展是为了应对与工业革命相结合的影响。本研究提出了一种通过有效利用纳米技术对有毒染料和聚芳烃进行修复的模型。为此，硫化锌 (ZnS)、硫化银 (Ag2S) 和双金属 ZnS-Ag2S 由单一来源的前体合成，并被评估为潜在的光催化剂。合成的纳米粒子通过一系列技术进行表征，如紫外可见光、PL、XRD、EDX、TEM 和 TGA。结果表明，制备的纳米颗粒为结晶性、球形，具有明显的原子平面，尺寸范围为 6-12 nm。每种合成材料都被测试为在可见光照射下降解代表性偶氮染料（水晶紫、刚果红）和多环芳烃（萘、菲和芘）的潜在光催化剂候选物。在与染料溶液接触 50 分钟后，合成的纳米粒子的降解效率计算为结晶紫超过 70%，刚果红为 80%，发现伪二级动力学模型最适合。合成的纳米粒子在降解多环芳烃方面也很有效。使用纳米粒子对多环芳烃的碎裂研究假定邻苯二甲酸途径是多环芳烃的主要机制。建议使用单一材料在一定程度上方便地处理具有混合污染物的环境隔间。该研究提供了经济和环境友好的修复模式。